/***************************************************************************************
* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
*
* NEMU is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
*          http://license.coscl.org.cn/MulanPSL2
*
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
*
* See the Mulan PSL v2 for more details.
***************************************************************************************/

#include <isa.h>
#include <cpu/cpu.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <memory/vaddr.h>
#include "sdb.h"

static int is_batch_mode = false;

void init_regex();
void init_wp_pool();

/* We use the `readline' library to provide more flexibility to read from stdin. */
static char* rl_gets() {
  static char *line_read = NULL;

  if (line_read) {
    free(line_read);
    line_read = NULL;
  }

  line_read = readline("(nemu) ");

  if (line_read && *line_read) {
    add_history(line_read);
  }

  return line_read;
}

static int cmd_c(char *args) {
  cpu_exec(-1);
  return 0;
}


static int cmd_q(char *args) {
  nemu_state.state = NEMU_QUIT;
  return -1;
}

static int cmd_si(char *args) {
    uint64_t N = 1;
    if(args!=NULL){
        sscanf(args, "%lu", &N);
    }
    cpu_exec(N);
    return 0;
}

static int cmd_info(char *args);
static int cmd_x(char *args);
static int cmd_p(char *args);
static int cmd_w(char *args);
static int cmd_d(char *args);
static int cmd_help(char *args);

static struct {
  const char *name;
  const char *description;
  int (*handler) (char *);
} cmd_table [] = {
  { "help", "Display information about all supported commands", cmd_help },
  { "c", "Continue the execution of the program", cmd_c },
  { "q", "Exit NEMU", cmd_q },

  /* TODO: Add more commands */
  // https://ysyx.oscc.cc/docs/ics-pa/1.4.html 提供了相关的模仿gdb命令实现要求
  { "si", "Single instruction: si [N]", cmd_si },
  { "info", "Print program state information: info SUBCMD", cmd_info },
  { "x", "Scan memory: x N EXPR", cmd_x },
  { "p", "Expression value: p EXPR", cmd_p },
  { "w", "Set watchpoint: w EXPR", cmd_w },
  { "d", "Delete watchpoint: d N", cmd_d },

};

#define NR_CMD ARRLEN(cmd_table)

static int cmd_help(char *args) {
  /* extract the first argument */
  char *arg = strtok(NULL, " ");
  int i;

  if (arg == NULL) {
    /* no argument given */
    for (i = 0; i < NR_CMD; i ++) {
      printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
    }
  }
  else {
    for (i = 0; i < NR_CMD; i ++) {
      if (strcmp(arg, cmd_table[i].name) == 0) {
        printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
        return 0;
      }
    }
    printf("Unknown command '%s'\n", arg);
  }
  return 0;
}

static int cmd_info(char *args) {
    if(args==NULL){
        printf("Usage: %s - %s\n", cmd_table[4].name, cmd_table[4].description);
    } else {
        if(args[0]=='r'){
            // isa.h
            isa_reg_display();
        } else if (args[0]=='w'){
            list_wp();
        } else {
            printf("Not supported: %s %c\n", cmd_table[4].name, args[0]);
        }
    }
    return 0;
}

static int cmd_x(char *args) {
    if(args==NULL){
        printf("Usage: %s - %s\n", cmd_table[5].name, cmd_table[5].description);
    } else {
        uint32_t N, EXPR, cur;
        sscanf(args, "%u %x", &N, &EXPR);
        for(int i=0; i<N*4; i+=4) {
            cur = EXPR + i;
            // memory/vaddr.h
            printf("0x%08x 0x%08x\n", cur, vaddr_read(cur, 4));
        }
    }
    return 0;
}

static int cmd_p(char *args) {
    if(args==NULL){
        printf("Usage: %s - %s\n", cmd_table[6].name, cmd_table[6].description);
    } else {
        char *expr_str = strtok(NULL, "\n");
        bool success;
        uint32_t res = expr(expr_str, &success);
        if(!success) printf("Failed calculate\n");
        else printf("$ = %u\t0x%x\n", res, res);
    }
    return 0;
}

static int cmd_w(char *args) {
    if(args==NULL){
        printf("Usage: %s - %s\n", cmd_table[7].name, cmd_table[7].description);
    } else {
        char *expr_str = strtok(NULL, "\n");
        WP* wp = new_wp(expr_str);
        if(wp) printf("Set watchpoint #%d\n", wp->NO);
    }
    return 0;
}

static int cmd_d(char *args) {
    if(args==NULL){
        printf("Usage: %s - %s\n", cmd_table[8].name, cmd_table[8].description);
    } else {
        int N;
        sscanf(args, "%d", &N);
        free_wp_index(N);
        printf("Remove watchpoint #%d\n", N);
    }
    return 0;
}

void sdb_set_batch_mode() {
  is_batch_mode = true;
}

void sdb_mainloop() {
  if (is_batch_mode) {
    cmd_c(NULL);
    return;
  }

  for (char *str; (str = rl_gets()) != NULL; ) {
    char *str_end = str + strlen(str);

    /* extract the first token as the command */
    char *cmd = strtok(str, " ");
    if (cmd == NULL) { continue; }

    /* treat the remaining string as the arguments,
     * which may need further parsing
     */
    char *args = cmd + strlen(cmd) + 1;
    if (args >= str_end) {
      args = NULL;
    }

#ifdef CONFIG_DEVICE
    extern void sdl_clear_event_queue();
    sdl_clear_event_queue();
#endif

    int i;
    for (i = 0; i < NR_CMD; i ++) {
      if (strcmp(cmd, cmd_table[i].name) == 0) {
        if (cmd_table[i].handler(args) < 0) { return; }
        break;
      }
    }

    if (i == NR_CMD) { printf("Unknown command '%s'\n", cmd); }
  }
}

void init_sdb() {
  /* Compile the regular expressions. */
  init_regex();

  /* Initialize the watchpoint pool. */
  init_wp_pool();
}
